Shure RPM181/BI Bidirectional Capsule for Beta 181 Microphone

Shure RPM181/BI Bidirectional Capsule for Beta 181 Microphone Bi-directional capsule replaces the capsule for a Beta 181 microphone. The bi-directional capsule is ideal for mono-drum overheads and dual instrument sound source applications. Features: Bidirectional capsule for Beta 181 Wide dynamic range High SPL handling No crossover distortion Exceptional low-frequency reproduction Locking ring provides secure connection Steel grille prevents damage to capsule Lightweight (5.1 oz) design with preamp Specifications: General: Type: Condenser Frequency Response: 20 to 20,000 Hz Polar Pattern: Bidirectional Sensitivity: -51.0 dBV/Pa (2.6 mV) Output Impedance: 110 ohms (at 1 kHz) Signal to Noise Ratio: 71.0 dB Self Noise: 23.0 dB SPL-A Common Mode Rejection: ≥55 dB Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3 Power Requirements: 11-52 V DC phantom power (IEC-61938), 2.4 mA maximum Weight: 5.1 oz (145 grams) Maximum SPL: 1000 Ohm Lo